CVE-2026-31737 net: ftgmac100: fix ring allocation unwind on open failure
A resource leak in the ftgmac100 network driver during initialization failure can lead to memory exhaustion and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31737?
CVE-2026-31737 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: ftgmac100: fix ring allocation unwind on open failure
ftgmac100_alloc_rings() allocates rx_skbs, tx_skbs, rxdes, txdes, and rx_scratch in stages. On intermediate failures it returned -ENOMEM directly, leaking resources allocated earlier in the function.
Rework the failure path to use staged local unwind labels and free allocated resources in reverse order before returning -ENOMEM. This matches common netdev allocation cleanup style.
Which versions are affected by CVE-2026-31737?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31737?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-31737 being exploited?
There is no known exploitation of CVE-2026-31737 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31737, DEBIAN-CVE-2026-31737, GHSA-3h6g-63ch-8mwf, ROOT-OS-DEBIAN-11-CVE-2026-31737, ROOT-OS-UBUNTU-2204-CVE-2026-31737, ROOT-OS-UBUNTU-2404-CVE-2026-31737 and 1 more.